Update custom_heads_flash_t5.py

custom_heads_flash_t5.py

@@ -307,98 +307,3 @@ class FlashT5ForQuestionAnswering(FlashT5PreTrainedModel):
             hidden_states=encoder_outputs.hidden_states,
             attentions=encoder_outputs.attentions,
         )
-
-
-
-class FlashT5ForQuestionAnswering(FlashT5PreTrainedModel):
-    _keys_to_ignore_on_load_missing = [r"encoder.embed_tokens.weight"]
-
-    def __init__(self, config: FlashT5Config):
-        super().__init__(config)
-        self.shared = nn.Embedding(config.vocab_size, config.d_model)
-
-        encoder_config = copy.deepcopy(config)
-        encoder_config.is_decoder = False
-        encoder_config.is_encoder_decoder = False
-        self.encoder = FlashT5Stack(encoder_config, self.shared)
-        self.qa_outputs = nn.Linear(config.hidden_size, config.num_labels)
-
-        # Initialize weights and apply final processing
-        self.post_init()
-
-        self.qa_outputs.weight.data.normal_(mean=0.0, std=config.initializer_factor * 1.0)
-        self.qa_outputs.bias.data.zero_()
-
-        self.model_parallel = False
-
-    def forward(
-        self,
-        input_ids: Optional[torch.LongTensor] = None,
-        attention_mask: Optional[torch.FloatTensor] = None,
-        head_mask: Optional[torch.FloatTensor] = None,
-        inputs_embeds: Optional[torch.FloatTensor] = None,
-        start_positions: Optional[torch.LongTensor] = None,
-        end_positions: Optional[torch.LongTensor] = None,
-        output_attentions: Optional[bool] = None,
-        output_hidden_states: Optional[bool] = None,
-        return_dict: Optional[bool] = None,
-    ) -> Union[Tuple, QuestionAnsweringModelOutput]:
-        r"""
-        Returns:
-
-        Example:
-
-        ```python
-        >>> from transformers import AutoTokenizer, MTxEncoderForQuestionAnswering
-
-        >>> tokenizer = AutoTokenizer.from_pretrained("MTx-small")
-        >>> model = MTxEncoderForQuestionAnswering.from_pretrained("MTx-small")
-        >>> input_ids = tokenizer(
-        ...     "Studies have been shown that owning a dog is good for you", return_tensors="pt"
-        ... ).input_ids  # Batch size 1
-        >>> outputs = model(input_ids=input_ids)
-        >>> start_logits = outputs.start_logits
-        >>> end_logits = outputs.end_logits
-        ```"""
-        return_dict = return_dict if return_dict is not None else self.config.use_return_dict
-
-        outputs = self.encoder(
-            input_ids,
-            attention_mask=attention_mask,
-            inputs_embeds=inputs_embeds,
-        )
-        sequence_output = outputs[0]
-
-        logits = self.qa_outputs(sequence_output)
-        start_logits, end_logits = logits.split(1, dim=-1)
-        start_logits = start_logits.squeeze(-1).contiguous()
-        end_logits = end_logits.squeeze(-1).contiguous()
-
-        total_loss = None
-        if start_positions is not None and end_positions is not None:
-            # If we are on multi-GPU, split add a dimension
-            if len(start_positions.size()) > 1:
-                start_positions = start_positions.squeeze(-1).to(start_logits.device)
-            if len(end_positions.size()) > 1:
-                end_positions = end_positions.squeeze(-1).to(end_logits.device)
-            # sometimes the start/end positions are outside our model inputs, we ignore these terms
-            ignored_index = start_logits.size(1)
-            start_positions = start_positions.clamp(0, ignored_index)
-            end_positions = end_positions.clamp(0, ignored_index)
-
-            loss_fct = CrossEntropyLoss(ignore_index=ignored_index)
-            start_loss = loss_fct(start_logits, start_positions)
-            end_loss = loss_fct(end_logits, end_positions)
-            total_loss = (start_loss + end_loss) / 2
-
-        if not return_dict:
-            output = (start_logits, end_logits) + outputs[1:]
-            return ((total_loss,) + output) if total_loss is not None else output
-
-        return QuestionAnsweringModelOutput(
-            loss=total_loss,
-            start_logits=start_logits,
-            end_logits=end_logits,
-            hidden_states=outputs.hidden_states,
-            attentions=outputs.attentions,
-        )